First I\'ll try (with my bad English) to explain what I\'ve got and what I need to have I have got the list of Events by TimeLine.
I am trying to optimize a query that contains a cross join. I havelarge query that I proceed to cross join with a derived table.
I am using the UNION in MySQL in order to bring together the results of two separate queries. These two queries use a lot of the same tables. Is there anyway to take advantage of this in order to opti
I have a Database table where I need to validate if a user has entered in the same or partly the same information.
How to optimize this? SELECT e.attr_id, e.sku, a.value FROM product_attr AS e, product_attr_text AS a WHERE e.attr_id = a.attr_id
I am creating some repor开发者_开发问答ts for an application to be used by various states.The database has the potential to be very large.I would like to know which way is the best way to get column t
This question is theoretical as well as开发者_StackOverflow practical.Any results indicating useful resources on optimizing queries will be appreciated.
Can we get a list of basic optimization techniques going (anything from modeling to querying, creating indexes, views to query optimization). It would be nice to have a list of these, one technique pe
mysql> EXPLAIN SELECT * FROM urls ORDER BY RAND() LIMIT 1; +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+
Setup: mysql> create table t(a integer unsigned,b integer unsigned); mysql> insert into t(a,b) values (1,2),(1,3),(2,4);
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